Samsung 76E, 76V, 753s, 753v, AN17L Service Manual

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COLOR MONITOR

Chassis Model AN17K* 753DFX, 76DF AN17L* 753v, 753s

76V, 76E

Manual

SERVICE

COLOR MONITOR CONTENTS

1. Precautions

2. Product Specifications

3. Disassembly & Reassembly

4. Alignment & Adjustments

5. Troubleshooting

6. Exploded View & Parts List

7. Electrical Parts List

8. Block Diagram

9. Wiring Diagram

10. Schematic Diagrams

AN17KS/AN17LS

AN17KT/AN17LT

WARNINGS

1. For continued safety, do not attempt to modify the circuit board.

2. Disconnect the AC power before servicing.

3. When the chassis is operating, semiconductor heatsinks are potential shock hazards.

1-1-1 Servicing the High Voltage and CRT :

WARNING: A high voltage VR replaced in the

wrong direction may cause excessive X-ray emissions.

1. When servicing the high voltage system, remove the static charge by connecting a 10 kohm resistor in series with an insulated wire (such as a test probe) between the chassis and the anode lead.

2. When troubleshooting a monitor with excess HV, avoid being unnecessarily close to the monitor. Do not operate the monitor for longer than is necessary to locate the cause of excessive voltage.

3. High voltage should always be kept at the rated value (not higher). Only when high voltage is excessive are X-rays capable of penetrating the shell of the CRT, including the lead in glass material. Operation at high voltages may also cause failure of the CRT or high voltage circuitry.

4. When the HV regulator is operating properly, there is no possibility of an X-ray problem. Make sure the HV does not exceed its specified value and that it is regulating correctly.

5. The CRT is especially designed to prohibit X-ray emissions. To ensure continued X-ray protection, replace the CRT only with one that is the same or equivalent type as the original.

6. Handle the CRT only when wearing shatterproof goggles and after completely discharging the high voltage anode.

7. Do not lift the CRT by the neck.

1-1-2 Fire and Shock Hazard

Before returning the monitor to the user, perform the following safety checks:

1. Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the monitor.

2. Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacitor networks, mechanical insulators, etc.

3. Leakage Current Hot Check (Figure 1-1):

WARNING: Do not use an isolation transformer during

this test.

Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI C101.1, Leakage Current for

Appliances), and Underwriters Laboratories (UL Publication UL1410, 59.7).

4. With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unit’s AC switch first in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit, etc.) and all exposed metal parts, including: metal cabinets, screwheads and control shafts. The current measured should not exceed 0.5 milliamp. Reverse the power-plug prongs in the AC outlet and repeat the test.

Figure 1-1. Leakage Current Test Circuit

1-1-3 Product Safety Notices

Some electrical and mechanical parts have special safety-related characteristics which are often not evident from visual inspection. The protection they give may not be obtained by replacing them with components rated for higher voltage, wattage, etc. Parts that have special safety characteristics are identified by

on schematics and parts lists. A substitute replacement that does not have the same safety characteristics as the recommended replacement part might create shock, fire and/or other hazards. Product safety is under review continuously and new instructions are issued whenever appropriate.

Components identified by on schematics and parts lists must be sealed by a soldering iron after replacement and adjustment.

AN17K*/AN17L* 1-1

1 Precautions

1-1 Safety Precautions

DEVICE UNDER TEST

TEST ALL

EXPOSED METAL

SURFACES

(READING SHOULD

NOT BE ABOVE 0.5mA)

LEAKAGE CURRENT

TESTER

2-WIRE CORD

ALSO TEST WITH

PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)

EARTH

GROUND

1. Servicing precautions are printed on the cabinet, and should be followed closely.

2. Always unplug the unit’s AC power cord from the AC power source before attempting to: (a) remove or reinstall any component or assembly, (b) disconnect PCB plugs or connectors, (c) connect all test components in parallel with an electrolytic capacitor.

3. Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes used. The internal wiring is sometimes clamped to prevent contact with thermally hot components. Reinstall all such elements to their original position.

4. After servicing, always check that the screws, components and wiring have been correctly reinstalled. Make sure that the area around the serviced part has not been damaged.

1. Immediately before handling any semiconductor components or assemblies, drain the electrostatic charge from your body by touching a known earth ground. Alternatively, wear a discharging wriststrap device. To avoid a shock hazard, be sure to remove the wrist strap before applying power to the monitor.

2. After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent accumulation of an electrostatic charge.

3. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESDs.

4. Use only a grounded-tip soldering iron to solder or desolder ESDs.

5. Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static” can generate electrical charges sufficient to damage ESDs.

5. Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal panels, input terminals and earphone jacks).

6. Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON. Connect an insulation resistance meter (500 V) to the blades of the AC plug.

The insulation resistance between each blade of the AC plug and accessible conductive parts (see above) should be greater than 1 megohm.

7. Never defeat any of the +B voltage interlocks. Do not apply AC power to the unit (or any of its assemblies) unless all solid-state heat sinks are correctly installed.

8. Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrument’s ground lead last.

6. Do not remove a replacement ESD from its protective package until you are ready to install it. Most replacement ESDs are packaged with leads that are electrically shorted together by conductive foam, aluminum foil or other conductive materials.

7. Immediately before removing the protective material from the leads of a replacement ESD, touch the protective material to the chassis or circuit assembly into which the device will be installed.

Caution: Be sure no power is applied to the

chassis or circuit and observe all other safety precautions.

8. Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing clothes together, or lifting your foot from a carpeted floor can generate enough static electricity to damage an ESD.

9. Indicates ESDs on the Schematic Diagram in this manual.

1 Precautions

1-2 AN17K*/AN17L*

1-3 Electrostatically Sensitive Devices (ESD) Precautions

Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly called Electrostatically Sensitive Devices (ESD). Examples of typical ESD are integrated circuits and some field-effect transistors. The following techniques will reduce the incidence of component damage caused by static electricity.

1-2 Servicing Precautions

WARNING 1:First read the “Safety Precautions” section of this manual. If unforeseen circumstances

create conflict between the servicing precautions and safety precautions, always follow the safety precautions.

WARNING 2:A high voltage Micom control replaced in the wrong direction may cause excessive X-

ray emissions.

WARNING 3:An electrolytic capacitor installed with the wrong polarity might explode.

AN17K*/AN17L* 2-1

2 Product Specifications

2-1 Specifications

Picture Tube 17-Inch (43 cm): 16-inch (40.6 cm) viewable,

Flat-face, 90˚ Deflection, 0.20 mm (Horizontal) Dot pitch, Silica coated with anti-electrostatic properties (TCO: Multilayer coating), Medium-short persistence phosphor

Scanning Frequency Horizontal : 30 kHz ~ 70 kHz

Vertical : 50 Hz ~ 160 Hz Display Colors Unlimited colors Maximum Resolution Horizontal : 1280 Dots

Vertical : 1024 Lines Input Video Signal Analog, 0.7 Vp-p positive at 75 Ω, internally terminated Input Sync Signal Separate Sync: TTL level, positive/negative Maximum Pixel Clock rate 110 MHz

Active Display Horizontal : 312 mm ± 4 mm, Vertical : 234 mm ± 4 mm Input Voltage AC 90 ~ 264 Volts, 60 Hz or 50 Hz ± 3 Hz Power Consumption 90 Watt (max) Dimensions (W x D x H)

(Net/Gross) AN17KS/AN17KT 15.7 x 16.2 x 15.7 Inches (398 x 412 x 400 mm) / 20.4 x 22.8 x 18.4 Inches (517 x 580 x 468 mm) AN17LS 15.7 x 16.2 x 15.7 Inches (398 x 412 x 400 mm) / 18.3 x 20.2x 18.0 Inches (464 x 512 x 458 mm) AN17LT 15.7 x 16.2 x 15.7 Inches (398 x 412 x 400 mm) / 18.3 x 20.4x 18.4 Inches (464 x 517 x 467 mm)

Weight (Net/Gross) AN17KS 15.9 kg (35.1 lbs) / 18.68 kg (41.2 lbs) AN17KT 16.2 kg (35.7 lbs) / 18.7 kg (41.2 lbs) AN17LS 15.0 kg (33.1 lbs) / 17.5 kg (38.6 lbs) AN17LT 15.0 kg (33.1 lbs) / 17.5 kg (38.6 lbs)

Environmental Considerations Operating Temperature : 32°F ~ 104°F (0°C ~ 40°C)

Humidity : 10 % ~ 80 %

Storage Temperature : -4°F ~ 113°F (-20°C ~ 45°C)

Humidity : 5 % ~ 95 %

• Above models comply with SWEDAC (MPR II) recommendations for reduced electromagnetic fields.

• Designs and specifications are subject to change without prior notice.

Item

Description

2 Product Specifications

2-2 AN17K*/AN17L*

2-2 Pin Assignments

Figure 2-1. Male Type Figure 2-2. Male Type

Sync Type

Pin No.

Separate

Macintosh

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15

Red Green Blue N-C DDC Return GND-R GND-G GND-B N-C GND-Sync/Self-raster N-C DDC Data H-Sync V-Sync DDC Clock

GND-R Red H/V Sync Sense 0 Green GND-G Sense 1 Reserved Blue Sense 2 GND V-Sync GND-B GND H-Sync

2 Product Specifications

AN17K*/AN17L* 2-3

QRS

Video

Sync

Horizontal

Vertical

CDE

Video

Sync

Separate Sync

2-3 Timing Chart

This section of the service manual describes the timing that the computer industry recognizes as standard for computer-generated video signals.

C D

Video

Sync

Video

Q R S

A : Line time total B : Horizontal sync width O : Frame time total P : Vertical sync width C : Back porch D : Active time Q : Back porch R : Active time E : Front porch S : Front porch

fH (kHz) A µsec B µsec C µsec D µsec E µsec fV (Hz) O msec P msec Q msec R msec S msec Clock

Frequency (MHz)

Polarity H.Sync

V.Sync Remark

IBM

VESA

800/85 Hz 800 x 600

1024/85 Hz 1024 x 768

VGA3/60 Hz 640 x 480

VGA2/70 Hz 720 x 400

31.469

31.778

3.813

1.907

25.422

0.636

59.940

14.268

0.064

1.048

15.253

0.318

25.175

Negative

Positive

Separate

31.469

31.777

3.813

1.907

25.422

0.636

70.087

16.683

0.064

1.080

12.711

0.413

28.322

Negative Negative Separate

37.500

26.667

2.032

3.810

20.317

0.508

75.000

13.333

0.080

0.427

12.800

0.027

31.500

Negative Negative Separate

43.269

23.111

1.556

2.222

17.778

1.556

85.008

11.764

0.671

0.578

11.093

0.023

36.000

Negative Negative Separate

53.674

18.631

1.138

2.702

14.222

0.569

85.061

11.756

0.056

0.503

11.179

0.019

56.250

Positive Positive

Separate

68.677

14.561

1.016

2.201

10.836

0.508

84.997

11.765

0.044

0.524

11.183

0.015

94.500

Positive Positive

Separate

640/75 Hz 640 x 480

640/85 Hz 640 x 480

Table 2-1 Timing Chart

Mode

Timing

2 Product Specifications

2-4 AN17K*/AN17L*

Memo

3-1-1 Before Disassembly

1. Disconnect power cord from the monitor.

2. With a pad beneath it, stand the monitor on its front with the screen facing downward and the base close to you.

3-1-2 Cabinet Disassembly

1. Remove the Stand from the monitor. (Refer to Stand manual)

2. Remove 2 screws on the Rear cover.

3. Tilt the monitor by lifting at the rear.

4. Push the Opening jig in to each groove along the top of the monitor until makes a “tak” sound. (2 grooves : Left and Right, Make sure each snap is disengaged.)

5. Pull the Rear Cover up and away from the monitor.

AN17K*/AN17L* 3-1

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the AN17K*/AN17L* monitor.

WARNING: This monitor contains electrostatically sensitive devices. Use with caution when

handling these components.

3-1 Disassembly

Cautions: 1. Disconnect the monitor from the power source before disassembly.

2. To remove the Rear Cover, you must use the special opening jig tool.

Figure 1

Figure 2

Figure 3

Figure 4

6. Remove the Shield.(TCO 99)

7. Using pinch-nose pliers or ling-nose pliers, carefully disconnect the Anode Cap from the CRT.

Warning: Do not touch the Anode contact

on the CRT (High Voltage may remain).

3-1-3 Removing the CRT Socket PCB

1. Complete all previous steps.

2. Loosen the screw on the CRT Neck and remove the CRT Socket PCB from the CRT.

3. Disconnect all connectors on the CRT Socket PCB.

4. Using a soldering iron, disconnect the Ground (GND) on the back of the Video Shield and remove the Shield Cap.

5. Remove the screw on the front of the Shield Socket.

6. Desolder the 4 tabs on the CRT Socket PCB and remove Shield.

7. Place the Video PCB on a flat, level surface that is protected from static electricity.

3-1-4 Removing the Main PCB

1. Complete all previous steps.

2. Disconnect the Degaussing Coil at CN603 on the Main PCB.

3. Disconnect all easily accessible ground wires on the PCB and Bottom Chassis.

4. Disconnect the DY connector at the CN404 connector on the Main PCB.

5. Using the jig, release the snaps (2) connecting the Front Cover and the PCB then lift up the bottom to separate the two shields.

6. Disconnect the tilt connector at the CN304 connector on the Main PCB.

7. Disconnect the Sub PCB connector at the CN604 connector on the Main PCB.

8. Remove the screws on the back and along each side of the bottom chassis.

9. Carefully lift the Main PCB Assy and remove the remaining ground wires.

10. Place the Main PCB Assy on a flat, level surface that is protected from static electricity.

3-1-5 CRT Assy Disassembly

1. Complete all previous steps.

2. Straighten the Degaussing Coil Assembly coated metal ties and lift the Coil Assy from the CRT.

3. Remove the four corner screws and lift the CRT up and away from the Front Cover Assembly and place it on a padded surface.

Caution: Do not lift the CRT by the neck.

If you will be returning this CRT to the monitor, be sure to place the CRT face downward on a protective pad.

3 Disassembly and Reassembly

3-2 AN17K*/AN17L*

3-2 Reassembly

Reassembly procedures are in the reverse order of disassembly procedures.

Figure 6

Figure 7

Figure 5

4-1-1 Before Making Adjustments

4-1-1 (a) ORIENTATION

When servicing, always face the monitor to the east.

4-1-1 (b) WARM-UP TIME

The monitor must be on for 30 minutes before starting alignment. Warm-up time is especially critical in color temperature and white balance adjustments.

4-1-1 (c) SIGNAL

Analog, 0.7 Vp-p positive at 75 ohm, internal termination Sync: Separate (TTL level negative/positive)

4-1-1 (d) SCANNING FREQUENCY

Horizontal : 30 kHz to 70 kHz (Automatic) Vertical : 50 Hz to 160 Hz (Automatic)

Unless otherwise specified, adjust at the 1024 x 768 mode (68 kHz/85 Hz), Refer to Table 2-1 on page 2-3.

4-1-2 Required Equipment

The following equipment may be necessary for adjustment procedures:

4-1-2 (a) DISPLAY CONTROL ADJUSTMENT

1. Non-metallic (–) screwdriver:

1.5, 2.5, 3 mm

2. Non-metallic (+) screwdriver:

1.5, 2.5, 3 mm

3. Digital Multimeter (DMM), or Digital Voltmeter

4. Signal generator, or DM200 software

5. Personal computer

4-1-2 (b) COLOR ADJUSTMENTS

1. All equipment listed in 4-1-2 (a), above

2. Color analyzer, or any luminance measurement equipment.

AN17K*/AN17L* 4-1

4 Alignment and Adjustments

This section of the service manual explains how to make permanent adjustments to the monitor. Directions are given for adjustments using the monitor Interface Board Ver. 2.0 and software (Softjig).

4-1 Adjustment Conditions

Caution: Changes made without the Softjig are saved only to the user mode settings. As such, the

settings are not permanently stored and may be inadvertently deleted by the user.

4 Alignment and Adjustments

4-2 AN17K*/AN17L*

Signal: 1024 x 768 (68 kHz/85 Hz) Display image: Don’t care Contrast: Minimum Brightness: Minimum Limit: 26.0 kV ± 0.3 kV

Measure the high voltage level at the anode cap. High voltage should be within the limit as above.

4-2-2 CENTER RASTER

Adjust SW401 so that the back raster comes to the center when you apply basic mode for 17”.

4-2-3 Centering

Centering means to position the center point of the display in the middle of the display area. Horizontal size and position and vertical size and position control the centering of the display.

Adjust the horizontal size and vertical size to their optimal settings: 312 mm (H) x 234 mm (V).

Adjust the horizontal position and vertical position to ≤ 5.0 mm of the center point of the screen.

|A-B| ≤ 5.0 mm. |C-D| ≤ 5.0 mm.

Figure 4-3. Centering

* In Softjig window, “Geometry” has to be

selected for GD adjustment.

4-2-3 (a) HORIZONTAL SIZE ADJUSTMENT CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

Click Standard Dump on the right Menu in the general field.

Use control bar after selecting size B+ in the left Menu to adjust the horizontal size of the display, Pattern to 312mm(Tolerance : ±4mm.)

Run the All Mode save in the Right Menu. Caution : Do not Run the All mode Save at the

other scannig times except for 1024x768 (68kHz/85Hz).

4-2-3 (b) VERTICAL SIZE ADJUSTMENT CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

Use control bar after selecting “V-SIZE” in left menu to adjust the vertical size of the display pattern to 234 mm.(Tolerance: ± 4 mm.)

4-2-3 (c) HORIZONTAL POSITION ADJUSTMENT CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Crosshatch pattern

Use control bar after selecting “H-POSITION” in left menu to center the horizontal image on the raster.

4-2-3 (d) VERTICAL POSITION ADJUSTMENT CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Crosshatch pattern

Use control bar after selecting “V-POSITION” in left menu to center the vertical image on the raster.

4-2-4 Linearity

Linearity affects the symmetry of images as they appear on the screen. Unless each row or column of blocks in a crosshatch pattern is of equal size, or within the tolerances shown in Tables 4-2 and 4-3, an image appears distorted, elongated or squashed.

Table 4-1. Standard Modes Linearity:

1024x768/85Hz

4-2 Display Control Adjustments

4-2-1 HIGH VOLTAGE

DISPLAY AREA

EDGE OF BEZEL

4 : 3

Horizontal: 20.9~23.1 Vertical : 20.9~23.1

Standard Modes Linearity

Each block (8 %)

Difference between

adjacent blocks (4 %)

Horizontal: Less than 0.88 mm Vertical : Less than 0.88 mm

4 Alignment and Adjustments

AN17K*/AN17L* 4-3

Table 4-2. Other Modes Linearity:

above 40 KHz(Hf)

Off Spec : Under 40 KHz (Hf)

4-2-4 (a) VERTICAL LINEARITY ADJUSTMENT CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

To adjust the Vertical Linearity, refer to Tables 4-2 and 4-3 for the tolerance range.

Use control bar after selecting “V-LINEARITY BAL” in left menu to optimize the image.

4-2-5 Trapezoid Adjustment

CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

Use control bar after selecting “TRAPEZOID” in left menu to make the image area rectangular.

Figure 4-4. Trapezoid

4-2-6 Pinbalance Adjustment

CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

Figure 4-5. Pinbalance

Use control bar after selecting “PINBALANCE” in left menu to optimize the image.

4-2-7 Parallelogram Adjustment

CONDITIONS

Scanning Frequency: 68 kHz/85 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

Use control bar after selecting “PARALLEL” in left menu to make the image area rectangular.

Figure 4-6. Parallelogram

4-2-8 Side Pincushion Adjustment

CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Crosshatch pattern

Use control bar after selecting “PINCUSHION” in left menu to straighten the sides of the image area.

4-2-9 Degauss

No adjustments are available for the degaussing circuit. The degaussing circuit can effectively function only once every 30 minutes.

4-2-10 To Delete the User Mode Data

To delete the adjustment data from the user modes, click “@4: USER DELETE” in right menu.

4-2-11 Save the Data

To save the adjustment data for a mode, press “@3: ALL MODE SAVE” in right menu.

| A - B | < 4 mm

4 : 3

Horizontal: 20.5~23.5 Vertical : 20.5~23.5

Supported Timing Mode

Each block (14 %)

Difference between

adjacent blocks (5 %)

Horizontal: Less than 1.10 mm Vertical : Less than 1.10 mm

D1 D2 D1

4 mm

| C1 |, | C2 | ≤ 2.0 mm, | D1 |, | D2 | ≤ 2.0 mm.

Figure 4-7. Pincushion

D1 D2

4 Alignment and Adjustments

4-4 AN17K*/AN17L*

CAUTION:Check below condition before color

adjustment Video signal : Analog 0.7 Vp-p (at 75 Ω) Sync : TTL level (H, V seperate signal)

* Select “Color” in Softjig menu for color adjustment.

4-3-1 Color Coordinates (Temperature)

Color temperature is a measurement of the radiant energy transmitted by a color. For computer monitors, the color temperature refers to the radiant energy transmitted by white. Color coordinates are the X and Y coordinates on the chromaticity diagram of wavelengths for the visible spectrum.

CONDITIONS

Measurement instrument: Color analyzer Scanning frequency: 68 kHz/85 Hz Display image: White flat field at

center of display area

Luminance: Maximum

PROCEDURE

Use the directions in sections 4-3-2 through 4-3-3 to adjust the color coordinates for: 9300K to x = 0.283 ± 0.02, y = 0.298 ± 0.02 6500K to x = 0.313 ± 0.02, y = 0.329 ± 0.02

4-3-2 Color Adjustments for 9300K

4-3-2 (a) BACK RASTER COLOR ADJUSTMENT CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Back raster pattern Brightness: Maximum Contrast: Maximum

1. Select “@1: CHANNEL 1” in right menu to

control the color for 9300K.

2. Adjust the luminance of the back raster to between 0.5 to 0.7 ft-L using control bar after selecting “GREEN CUTOFF” in the menu.

3. Use control bar after selecting “BLUE CUTOFF” in left menu to set the “y” coordinate to 0.298 ± 0.02.

4. Use control bar after selecting “RED CUTOFF” in left menu to 0.283 ± 0.02.

* If color values can not be matched to desirable

values, repeat sequences 3 and 4 after readjusting “GREEN CUTOFF” control.

4-3-2 (b) WHITE BALANCE ADJUSTMENT CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: White box pattern Brightness: 0.06ft-L at Back Raster

Pattern Display

Contrast: Maximum

Figure 4-8. White Box Pattern

1. Use control bar after selecting “RED GAIN”, “GREEN GAIN” and “BLUE GAIN” to adjust

the luminance to AN17K*, (40 ± 1 ft-L), AN17L*(42 ± 1 ft-L) with the color coordinates ranged for 9300K to x = 0.283 ± 0.02, y = 0.298 ± 0.02.

4-3-2 (c) ABL ADJUSTMENT CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Full white pattern Brightness: Maximum Contrast: Maximum

Figure 4-9. Full White Pattern

1. Check the ABL. If it is not within specifications, use the ABL controls to adjust. (30 ± 1 ft-L ) AN17K*

(31 ± 1 ft-L ) AN17L*

2. Select “@4: COLOR SAVE” to save the data.

3. Select “@6: ALL COLOR SAVE” to save CH2.

4-3 Color Adjustments

1/3H-1/2H

1/3V-1/2V

FRONT BEZEL OPENING BACK RASTER

WHITE WINDOW

FRONT BEZEL OPENING BACK RASTER

WHITE WINDOW

4 Alignment and Adjustments

AN17K*/AN17L* 4-5

4-3-2 (d) WHITE BALANCE ADJUSTMENT VERIFICATION CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Back raster pattern

Full White Pattern

X-Y Coordinates: x = 0.283 ± 0.02,

y = 0.298 ± 0.02 ABL Luminance Refer to 4-3-2(c) Brightness: Maximum Contrast: 5 ft-L, 24 ft-L

1. Check whether the color coordinates of the

back raster satisfy the above spec. If they do not, return to 4-3-2 (a) and readjust

all settings.

2. Display a full white pattern.

3. Select “Geometry” in softjig menu.

4. Select “@7: 5-ft “ in right menu.

5. Check whether the white coordinates of the

video meet the above coordinates spec.

6. Select “@8: 24-ft “ in right menu.

7. Check whether the white coordinates of the

video satisfies the above spec. If they do not, return to 4-3-2 (a) and readjust

all settings. Select “Color” and click “@2: CHANNEL 2”

for color ajdustment for 6500K Repeat the sequence for 9300K adjustment. luminance values are the same as 9300K, but the color coordinats of back raster and white box are : x = 0.313 ± 0.02 y = 0.329 ± 0.02

4-3-3 Luminance Uniformity Check

Luminance is considered uniform only if the ratio of lowest to highest brightness areas on the screen is not less than 7.5:10.

CONDITIONS

Scanning frequency: 68 kHz/85 Hz

(1024 x 768) Display image: White flat field Brightness: Cut off point at 24 ft-L Contrast: Maximum

PROCEDURE

Measure luminance at nine points on the display screen (see figure below).

4-3-4 Focus Adjustment

CONDITIONS

Scanning frequency: 68 kHz/85 Hz

(1024 x 768) Display image: “H” character pattern Brightness: Cut off point Contrast: Maximum

PROCEDURE

1. Adjust the Focus VR on the FBT to display the

sharpest image possible.

2. Use Locktite to seal the Focus VR in position.

4-3-5 Color Purity Adjustment

Color purity is the absence of undesired color. Conspicuous mislanding (unexpected color in a uniform field) within the display area shall not be visible at a distance of 50 cm from the CRT surface.

CONDITIONS

Orientation: Monitor facing east Scanning frequency: 68 kHz/85 Hz Display image: White flat field Luminance: Cut off point at the center

of the display area Note: Color purity adjustments should only be

attempted by qualified personnel.

Figure 4-10. Luminance Uniformity Check Locations

4 Alignment and Adjustments

4-6 AN17K*/AN17L*

PROCEDURE

For trained and experienced service technicians only.

Use the following procedure to correct minor color purity problems:

1. Make sure the display is not affected by external magnetic fields.

2. Make sure the spacing between the PCM assembly and the CRT stem is 29 mm ± 1 mm.

3. Display a green pattern over the entire display area.

4. Adjust the purity magnet rings on the PCM assembly to display a pure green pattern. AN17K*(Optimum setting: x = 0.276 ± 0.015, y = 0.596 ± 0.015)

AN17L*(Optimum setting: x = 0.285 ± 0.015,

y = 0.600 ± 0.015)

5. Repeat steps 4 and 5 using a red pattern and then again, using a blue pattern.

Table 4-4. Color Purity Tolerances

(AN17KS Model)

(For 9300K color adjustment: x = 0.283 ± 0.02, y = 0.298 ± 0.02)

(AN17LS Model)

(For 9300K color adjustment: x = 0.283 ± 0.02, y = 0.298 ± 0.02)

6. When you have the PCMs properly adjusted, carefully glue them together to prevent movement during shipping.

Red: x = 0.645 ± 0.015 y = 0.318 ± 0.015 Green: x = 0.276 ± 0.015 y = 0.596 ± 0.015 Blue: x = 0.145 ± 0.015 y = 0.060 ±0.015

Red: x = 0.645 ± 0.015 y = 0.321 ± 0.015 Green: x = 0.285 ± 0.015 y = 0.600 ± 0.015 Blue: x = 0.142 ± 0.015 y = 0.057 ±0.015

AN17K*/AN17L* 5-1

5 Troubleshooting

5-1 Parts Level Troubleshooting

Notes: Check the following circuits.

• No raster appears: Power circuit, Horizontal output circuit.

• High voltage develops but no raster appears: Video output circuits.

• High voltage does not develop: Horizontal output circuits.

5-1-1 No Power Supply

Chirping noise exists?

Check and replace IC601.

Check and replace D601 and FH1

Done.

Yes

Repeating start?

Check and replace D606.

Yes

IC601 Pin 1 waveform is right?

Check and replace Q602, IC601,

IC605 and IC602.

Yes

C622 Voltage is 13 V ± 0.5V?

Check and replace IC201, IC301,

IC605, IC401, Q402, Q404, and 12V Regulafor circuit.

Yes

Normal operation?

Replace Main board.

Verify voltages.

WAVEFORMS

100 V (IC601, #1)

CH1 P-P = 100 V CH1 RMS = 350.2 V

5 Troubleshooting

5-2 AN17K*/AN17L*

5-1-2 DPMS Failure

Make No H/V Sync. (power off mode)

Check signal source

H/V Sync. video level.

LED blinks?

Check IC201 Pin 40.

Yes

+12 V line off?

Check IC201 Pin 5/Pin 6 and

Q610/Q602 operation.

Yes

Q602 Base voltage exists?

Check IC201 Pin 5.

Check and replace Q602 and IC201.

IC601 Pin 1 output

voltage exists?

Refer to 5-1-1 No Power Supply.

Done

Yes

100V (IC601, #1)

CH1 P-P = 100V CH1 RMS = 325.8 V

WAVEFORMS

5 Troubleshooting

AN17K*/AN17L* 5-3

5-1-3 H_Deflection Failure

Does Horizontal pluse signal

appear at Pin 26 of IC401?

Check IC401.

Yes

Does 110 Vp-p signal appear

at Collector of Q403?

Check Q403.

Yes

Check Q402, Q404 and T401.

Does PWM output signal appear

at Pin 28 (B_DRV) of IC401?

Check IC401.

Check 12 V line.

Yes

Does DC 12V appear at

Pin 29 of IC401?

Yes

5-1-4 S Correction Failure

S1~S3 signals are correct at each

frequency block?

Check S1 ~ S3 signal.

Check and replace Q409, Q410,

Q411, Q414, Q415, Q416, D402,

D403, QD404.

Yes

Check and replace IC201.

2.00 V (IC401, #28)

CH1 P-P = 2.00V CH1 RMS = 5.868V

2.00V (IC401, #26)

CH1 P-P = 2.00V CH1 RMS = 5.868V

20.0 V (Q403, Collector)

CH1 P-P = 20.0 V CH1 RMS = 46.80V

WAVEFORMS

5 Troubleshooting

5-4 AN17K*/AN17L*

5-1-5 H_Lin. Failure Check and Replace T402

5-1-6 Invariable H_Size

IC401 Pin 28 voltage varies with

different B_DRV DAC values?

Q402 Gate output duty varies with

different B_DRV DAC values?

Check some parts around Q402,

IC401 Pin 14 ~ 16.

Yes

Check and replace IC401.

5-1-7 Abnormal H_Size

IC401 Pin 24 output duty

varies with different B+ offset

DAC values?

Q404 Collector

waveform is right?

Check and replace Q405,

Q406, Q407, and Q408.

Check Components

around D409 and L401.

Yes

Check and replace IC201.

200 V (Q404, Collector)

CH1 P-P = 200V CH1 RMS = 387.2V

WAVEFORMS

5 Troubleshooting

AN17K*/AN17L* 5-5

5-1-8 Side Pin or Trap Failure

IC401 Pin 24 output exists?

Yes

Check and replace IC401.

Refer to 5-1-7

Abnormal H_Size

5-1-9 Para. or Pin Balance Failure

IC401 Pin 24 output varies with

different DAC values?

Replace IC401.

5-1-10 Tilt Failure

IC201 Pin 20 output duty varies

with different DAC values?

Q611 Base output varies with

different DAC values?

Check and replace Q611.

Check and replace Q301 and Q302.

Yes

Check and replace IC201.

Check tilt connector connection

Refer to 5-1-7

Abnormal H_Size

Yes

1.00 V (IC401, #24)

CH1 P-P = 1.00V CH1 RMS = 3.008 V

WAVEFORMS

5 Troubleshooting

5-6 AN17K*/AN17L*

5-1-11 V Deflection Failure

13V and –13V lines are on?

IC401 Pin 23 output exists?

Check and replace IC401.

Yes

Refer to 5-1-1 No Power Supply

IC301 Pin 6 output exists?

Check and replace

components around IC301.

Yes

Check DY connector connection.

5-1-12 V Size or Position Variation Failure

IC401 Pin 23 output varies with

different DAC values?

Yes

Check and replace IC201 and IC401.

Check and replace IC301.

500 V (IC401, #23)

CH1 P-P = 500 V CH1 RMS = 1.425 V

10.0 V (IC301, #6)

CH1 P-P = 10.0 V CH1 RMS = 5.06 V

WAVEFORMS

5 Troubleshooting

AN17K*/AN17L* 5-7

5-1-13 High Voltage Failure

IC401 Pin 28 OSC pulse exists?

Q402 Gate driving pulse exists?

Check and replace Q401 and Q420.

Yes

Check and replace IC401

and +12 V line.

Q402 Drain pulse exists?

Check and replace

Q402, L402 and D401.

Check 50V Line.

Yes

Done

IC101 Pin 8 input exists and

varies with different patterns?

Check and replace IC101.

Input full white pattern to monitor.

Yes

T501 Pin 8 output exists?

Check and replace T501.

Yes

IC201 Pin 26 output exists and varies with different patterns?

Check and replace IC201.

Yes

Done

Check CN102.

5-1-14 ABL Failure

2.00 V (IC401, #28)

CH1 P-P = 2.00 V CH1 RMS = 5.868 V

2.00 V (Q402, Gate)

CH1 P-P = 2.00 V CH1 RMS = 7.692V

50.0 V (Q402, Drain)

CH1 P-P = 50.0 V CH1 RMS = 73.7V

WAVEFORMS

5 Troubleshooting

5-8 AN17K*/AN17L*

5-1-15 Dynamic Focus Failure

IC401 Pin 32 output is right?

Some parts around Q551 are right?

Replace failed part.

Yes

Replace the IC401.

T502 Pin 6 input is right?

Check and replace C432.

Yes

T502 Pin 1 output is right?

Replace the T502.

Yes

Check the connection between FBT

Focus pin and CRT Socket PCB.

2.00 V (IC401, #32)

CH1 P-P = 2.00V CH1 RMS = 6.124V

50.0 V (T502, #6)

CH1 P-P = 50.0V CH1 RMS = 75.6V

100 V (T502, #1)

CH1 P-P = 100V CH1 RMS = 124.0V

WAVEFORMS

5 Troubleshooting

AN17K*/AN17L* 5-9

5-1-16 No Video

IC101 Pin 12, 14 and 16 inputs

are right?

IC101 Pin 18, 21 and 24

outputs are right?

Check I2C bus and +12V line.

Yes

Check the signal cable connection.

IC102 Pin 9, 10 and 11

outputs are right?

Check +12V, +80V line.

Check and replace IC102.

Yes

Cathode DC levels are right?

Check +80V line.

Check and replace IC104.

Yes

G2 voltage is right?

Check G2 wire, CRT Socket board

and FBT.

Change CRT.

Yes

Done.

Check signal cable and connection.

1.00V (IC101 #12,14,16)

CH1 P-P = 1.00V CH1 RMS = 2.452V

1.00V (IC101 #18,21,24)

CH1 P-P = 1.00V CH1 RMS = 2.792V

20.0V (IC102, #9, 10, 11)

CH1 P-P = 20.0V CH1 RMS = 40.52V

WAVEFORMS

5 Troubleshooting

5-10 AN17K*/AN17L*

5-1-17 Micom Failure

IC201 Pin 11 input voltage is 5V?

IC201 Pin 13 and 14 inputs

are right?

Check C202, C203 and X201.

Yes

Check IC604.

IC201 Pin 18 input is right?

Check and replace IC201 and R206.

Yes

All in/output values are right?

Replace IC201.

Yes

Done

1.00 V (IC201, #13, 14)

CH1 P-P = 1.00 V CH1 RMS = 2.108V

WAVEFORMS

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